I do think ideally it would be nice if civs at least had something in their core civ ability carry through ages. If you just take the 2 types of a civ, and America only gets the antiquity Expansionist and antiquity Economic legacies and tree, you do lose something from them. It's almost like going back to the civ 3 days where there were only a couple traits available.
Now, again, whether that's the direction they go or not, I dunno. At least with that, it's not necessarily adding any extra art assets, and for the most-part, all it would be is a little copy-paste of some modifiers and then a little bit of scaling balance. Maybe America gives you 50 gold per resource in antiquity, 100 in exploration, and they boost it to 150 or 200 in modern. Obviously there's some civs where you'd have to create something new (Japan can't overbuild anything in antiquity). Again, is that enough combined with city names to make playing in America out of their age good enough? I'm not sure either. It slightly depends on if they market this mode as like a slight alternate fun mode, or if they market it as like a true core alternate way to play the game, with all the balance aspects in consideration.
Now, again, whether that's the direction they go or not, I dunno. At least with that, it's not necessarily adding any extra art assets, and for the most-part, all it would be is a little copy-paste of some modifiers and then a little bit of scaling balance. Maybe America gives you 50 gold per resource in antiquity, 100 in exploration, and they boost it to 150 or 200 in modern. Obviously there's some civs where you'd have to create something new (Japan can't overbuild anything in antiquity). Again, is that enough combined with city names to make playing in America out of their age good enough? I'm not sure either. It slightly depends on if they market this mode as like a slight alternate fun mode, or if they market it as like a true core alternate way to play the game, with all the balance aspects in consideration.

